Synthesis and characterisation of the first unidimensional cobalt hydrogen phosphate, [H3N(CH2)3NH3][Co(HPO4)2]

Abstract

The first unidimensional organically templated cobalt hydrogenphosphate, [H₃N(CH₂)₃NH₃][Co(HPO₄)₂], has been synthesized at 433 K under solvothermal conditions in the presence of 1,3-diaminopropane and the structure determined at 150 K using single-crystal X-ray diffraction. The compound contains anionic chains of formula [Co(HPO₄)₂]^2– constructed from edge-sharing 4-membered rings of alternating CoO₄ and HPO₄ tetrahedra from which hang additional “pendant” HPO₄ groups. The chains, which are structurally similar to those found recently in unidimensional aluminophosphates, are held together by a network of hydrogen bonds involving both interchain and chain–diamine interactions.